Rails - Sep 2009 - Connect a field with an error

Hi, i have this in a my form for registration user

<% fields_for "user[location_attributes]", @user.location do
|location_form| %>
    <%= location_form.text_field :full_address %>
<% end %>

the location is required.

and so if i submit the form without insert the location the instruction:

<%= error_messages_for :user %>


print: location required.

but in the field there isn''t the div
<div class="fieldWithErrors">
around the field of the location like the others fields required

how i can connect the error of the location with the field:
<input id="user_location_attributes_full_address"
class="ac_input"
type="text" value="" size="30"
name="user[location_attributes][full_address]" />

thanks.
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